That looks like a repainted O2 tank. Anyway I've never heard of a "slim 7"

Interesting. Is an O2 tank painted a particular way? I guess they would they would be interchangeable? Gas is gas right?

Works great for the space. Now I have my "squat 5" for around the house use/keg cleaning. Yeh, I made "slim 7" up.

It looks like a medical O2 tank which are green on the top. Yeah I've always wondered what the difference was except that differences are probably just to keep gases from being mixed up and being in the wrong tank.

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It should have different threads so you can't accidentally hook up the wrong thing though, right?

The valve on an O2 tank has left hand threads for the regulator, if I remember correctly, but who knows if you can swap over a different valve and screw it into the tank.

If I remember correctly (big if, somedays) the valves are interchangable. The color the tank is painted is based on content so you don't hook up the wrong tank and so emergency personel can tell quickly what theyare dealing with. If the bottle can be hydro tested and stamped correctly for the gas going into it, you're good.

It should have different threads so you can't accidentally hook up the wrong thing though, right?

O2 has left hand as Jeff has said. The tank valve in my 10 LB CO2 tank would not fit into the opening on my medical O2 tank, as the diameter of the valve to tank threaded fitting is of larger diameter.

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Jeff RankertAnn Arbor Brewers GuildAHA Governing Committee BJCP NationalHome-brewing, not just a hobby, it is a lifestyle!